<?php
/**
 * Class Minify_CSS  
 * @package Minify
 */

/**
 * Minify CSS
 *
 * This class uses Minify_CSS_Compressor and Minify_CSS_UriRewriter to 
 * minify CSS and rewrite relative URIs.
 * 
 * @package Minify
 * @author Stephen Clay <steve@mrclay.org>
 * @author http://code.google.com/u/1stvamp/ (Issue 64 patch)
 */
class Minify_CSS {
	
	/**
	 * Minify a CSS string
	 * 
	 * @param string $css
	 * 
	 * @param array $options available options:
	 * 
	 * 'preserveComments': (default true) multi-line comments that begin
	 * with "/*!" will be preserved with newlines before and after to
	 * enhance readability.
	 *
	 * 'removeCharsets': (default true) remove all @charset at-rules
	 * 
	 * 'prependRelativePath': (default null) if given, this string will be
	 * prepended to all relative URIs in import/url declarations
	 * 
	 * 'currentDir': (default null) if given, this is assumed to be the
	 * directory of the current CSS file. Using this, minify will rewrite
	 * all relative URIs in import/url declarations to correctly point to
	 * the desired files. For this to work, the files *must* exist and be
	 * visible by the PHP process.
	 *
	 * 'symlinks': (default = array()) If the CSS file is stored in 
	 * a symlink-ed directory, provide an array of link paths to
	 * target paths, where the link paths are within the document root. Because 
	 * paths need to be normalized for this to work, use "//" to substitute 
	 * the doc root in the link paths (the array keys). E.g.:
	 * <code>
	 * array('//symlink' => '/real/target/path') // unix
	 * array('//static' => 'D:\\staticStorage')  // Windows
	 * </code>
	 *
	 * 'docRoot': (default = $_SERVER['DOCUMENT_ROOT'])
	 * see Minify_CSS_UriRewriter::rewrite
	 * 
	 * @return string
	 */
	public static function minify($css, $options = array()) 
	{
		$options = array_merge(array(
			'removeCharsets' => true,
			'currentDir' => null,
			'docRoot' => $_SERVER['DOCUMENT_ROOT'],
			'prependRelativePath' => null,
			'symlinks' => array(),
			'do_compress' => true,
		), $options);
		
		if ($options['removeCharsets']) {
			$css = preg_replace('/@charset[^;]+;\\s*/', '', $css);
		}
		if ($options['do_compress']) {
			require_once $GLOBALS['dirroot'].'/lib/class/Minify_CSS_Compressor.php';
			$css = Minify_CSS_Compressor::process($css, $options);
		}
		if (! $options['currentDir'] && ! $options['prependRelativePath']) {
			return $css;
		}
		require_once $GLOBALS['dirroot'].'/lib/class/Minify_CSS_UriRewriter.php';
		if ($options['currentDir']) {
			$css = Minify_CSS_UriRewriter::rewrite(
				$css
				,$options['currentDir']
				,$options['docRoot']
				,$options['symlinks']
			);  
		}
		if($options['prependRelativePath']) {
			return Minify_CSS_UriRewriter::prepend(
				$css
				,$options['prependRelativePath']
			);
		}
		return $css;
	}
}
